Printing-plate holder



Feb. 16 1926. 1,573,430

E. E. THIEL PRINTING PLATE HOLDER Filed August 22, 1924 ATTOR/Vfyj,

Patented Feb. I6, 1926).

UNETE STATES PATENT OFFICE.

EMIL E. THIEL, OF CINCINNATI, OEIO, ASSIGNOR TO THE PRINTING MACHINERYCOMPANY, OF CINCINNATI, OHIO, A. CORPORATION OF OHIO.

PRINTING-PLATE HOLDER.

Application filed. August 22, 1924. Serial No. 733,6e5.

To all whom it may concern:

Be it known-that I, EMIL E. Trust, a citizen of the United States, and aresident of Cincinnati, in the county of Hamilton and State of Ohio,have invented certain new and useful Improvements in Printing- PlateHolders, of which the following is a full, clear, and exact description,reference being had to the accompanying drawing, forming part of thisspecification.

My invention relates to devices adapted for use with a bed, forretaining printing plates and the like thereon. It further relates moreparticularly to such devices where used with printing plate beds havingnumerous holes therein, into which the devices of my invention aredropped.

Drop-in hooks as such devices are termed commercially, usually comprisea jaw, and a holder, the latter being adapted for dropping into theholes or channels in a printing plate bed, and some kind of meansresulting in the operator being able to adjust the position of the partsso as to bring the jaw up against a printing plate thereby holding theplate down on the bed, and also holding it against displacement in theplane of the bed.

It is the object of my invention to provide a structure wherein thecarrier is fixed, and the jaw movable, and in which the jaw is 7 givenits movement by a double acting mom-- her which imparts very rapidaction, and at the same time imparts a thrust to the jaw, and which isof self-locking type. More particularly it is my object to employ aright and left hand screw which is in engagement with the jaw and thecarrier in right and left hand threaded sockets, so that a turning ofthe screw will give a double movement, with threads of a pitch in thescrew which will not permit any jogging loose thereof, when understress. It is further my object to provide for a simple sturdy structureof aw and carrier with small number of parts and easy assembly andoperation.

I accomplish my objects by that certain construction and arrangement ofparts to v be hereinafter more specifically pointed out and claimed.

In the drawing:

Figure 1 is a top plan view of one of the devices located in a pressbed.

the lower ends thereof, to provide a shoul-.

der for engagement with a hold-down tongue or projection on the carrierportion of the device.

The carrier is formed with base l and two upright sides 5, 5, with thebase projecting from what may be termed the forward edges of the sidesin a tongue 6. The proportions of the carrier are such that it may betipped lnto the holes in the press bed, and then straightened up in sucha way that the tongue will lie under the shoulder in the base of the bedhole, and the carrier, as will be noted, holds the jaw between theuprights so that when the jaw is pressed against a plate, the carriercan not be tilted out reversely to the manner of its insertion. Thus thecarrier will not become dislodged when the jaw is in operation, but atother times can be tilted in and out of the holes, at will.

The uprights of the carrier are provided with holes 7 for a pivot pin 7,and holes 8 for a pivot pin 8.

The jaw is formed with the usual head 9, and a stem 10, which fitssnugly between the uprights of the carrier, and has a screw socket 11therein, communicating with a hole 12 that opens into the top of thejaw. The socket is formed with a left hand thread. The stem has also aleg 13 which is secured by the pivot pin 7 in pivotal relation with theforward edges of the uprights.

Mounted on the other pivot pin 8, is a bearing block 14, which has ascrew socket therein as at 15, same being right hand threaded. A screw16 having a left hand threaded portion for engagement in the stem, and aright hand portion for engagement in the bearing block, is set into saidrespective parts.

The entire device is thus formed of a and a right and left hand screw,which is a very simple structure and easy to put together.

In operation the device is dropped into a press bed hole and a toolinserted to engage the squared socket 17 in the upper end of the screw,the tool passing through the hole 12. v

The jaw will then be thrust either forward or retracted dependent uponhow. the screw is turned, and will be moved very rapidly into or out ofengagement with a printing plate to be held on the bed. The direction ofthethrust is such as to insure a tight engagement of the back of thecarrier with the'hole in the bed, when the jaw is in engagement with theplate. Having thus described my invention, what I claim as new anddesire to secure by Letters Patent, is

1. In a device of the character described,

the combination of a carrier, a bearing block mounted on the carrier,and a jaw, means for plvotally mounting the aw 1n the car- .rier and ascrew intermediate the jaw and bearing block, said screw having rightand left handthreads, and the bearingblock and jaw having right and lefthand threaded sockets to engage said screw, said screw being so placedthat turning thereof moves the aw withrelation to the carrier.

2. In a device of the character described, the combination with acarrier having a base, and interspaced sides. a bearing block, and ajaw, each being pivotally mounted in the carrier, a right and left handscrew available for turning through the jaw, and right and left handsockets in the jaw and the bearing block for said screw, for the purposedescribed.

3. In a device of the character described, the combination of a carrierhaving a base, and upright sides, a jaw having a threaded sockettherein, opening through the top of the jaw, a pivoted bearing block inthe carrier, means for movably mounting the jaw in the carrier, and saidbearing block having a threaded socket for an adjusting screw, said twothreaded sockets being right and left threaded respectively, and anadjusting screw having a right and a left hand threaded portion set intosaid two sockets, for the purpose described.

EMIL E. THIEL.

